Horizon Rig Down


“You may have heard the news in the last two days about the Deepwater Horizon drilling rig which caught fire, burned for two days, then sank in 5,000 ft of water in the Gulf of Mexico. There are still 11 men missing, and they are not expected to be found.

The rig belongs to Transocean, the world’s biggest offshore drilling contractor. The rig was originally contracted through the year 2013 to BP and was working on BP’s Macondo exploration well when the fire broke out. The rig costs about $500,000 per day to contract. The full drilling spread, with helicopters and support vessels and other services, will cost closer to $1,000,000 per day to operate in the course of
drilling for oil and gas. The rig cost about $350,000,000 to build in 2001 and would cost at least double that to replace today.

The rig represents the cutting edge of drilling technology. It is a floating rig, capable of working in up to 10,000 ft water depth. The rig is not moored; It does not use anchors because it would be too costly and too heavy to suspend this mooring load from the floating structure. Rather, a triply-redundant computer system uses satellite positioning to control powerful thrusters that keep the rig on station within a few feet of its intended location, at all times. This is called Dynamic Positioning.

The rig had apparently just finished cementing steel casing in place at depths exceeding 18,000 ft. The next operation was to suspend the well so that the rig could move to its next drilling location, the idea being that a rig would return to this well later in order to complete the work necessary to bring the well into production.
It is thought that somehow formation fluids – oil /gas – got into the wellbore and were undetected until it was too late to take action. With a floating drilling rig setup, because it moves with the waves, currents, and winds, all of the main pressure control equipment sits on the seabed – the uppermost unmoving point in the well. This pressure control equipment – the Blowout Preventers, or ‘BOP’s” as they’re called, are controlled with redundant systems from the rig. In the event of a serious emergency, there are multiple Panic Buttons to hit, and even fail-safe Deadman systems that should be automatically engaged when something of this proportion breaks out. None of them were apparently activated, suggesting that the blowout was especially swift to escalate at the surface. The flames were visible up to about 35 miles away. Not the glow – the flames. They were 200 – 300 ft high.

All of this will be investigated and it will be some months before all of the particulars are known. For now, it is enough to say that this marvel of modern technology, which had been operating with an excellent safety record, has burned up and sunk taking souls with it.

The well still is apparently flowing oil, which is appearing at the surface as a slick. They have been working with remotely operated vehicles, or ROV’s which are essentially tethered miniature submarines with manipulator arms and other equipment that can perform work underwater while the operator sits on a vessel. These are what were used to explore the Titanic, among other things. Every floating rig has one on board and they are in constant use. In this case, they are deploying ROV’s from dedicated service vessels. They have been trying to close the well in using a specialized port on the BOP’s and a pumping arrangement on their ROV’s. They have been unsuccessful so far. Specialized pollution control vessels have been scrambled to start working the spill, skimming the oil up.

In the coming weeks they will move in at least one other rig to drill a fresh well that will intersect the blowing one at its pay zone. They will use technology that is capable of drilling from a floating rig, over 3 miles deep to an exact specific point in the earth – with a target radius of just a few feet plus or minus. Once they intersect their target, a heavy fluid will be pumped that exceeds the formation’s pressure, thus causing the flow to cease and rendering the well safe at last. It will take at least a couple of months to get this done, bringing all available technology to bear. It will be an ecological disaster if the well flows all of the while; Optimistically, it could bridge off downhole.

It’s a sad day when something like this happens to any rig, but even more so when it happens to something on the cutting edge of our capabilities. The photos that follow show the progression of events over the 36 hours from catching fire to sinking. ”

Here are the photos. Horizon Rig Down (pdf is a little slow to load)

Hat tip to Todd and Marcia (the birthday girl), and thanks to Susie for forwarding the narrative and photos.

9 Responses

  1. What a disastrous tragedy.
    It’s hard to ignore the enormous cost of this event, even with so many families loved ones lost forever.
    This report is very helpful in understanding how and what has happened.

  2. The environmental impact of the Deepwater Horizon oil rig sinking into the Gulf of Mexico will be felt for years to come. The financial impact is already being felt.

    As it sunk, the rig began spilling tens of thousands of gallons of oil into the water per day. Nearly a half-million gallons have already spilled and the toll could be worse than that of the Valdez accident.

    Fears are that oil from the well on the sea floor will begin making its way to the surface. Just 41 miles from the coast, the rig is situated so that this incident has brought a lot of business to a halt on the seas, and for those who depend on the Gulf along the shores. As the slick spreads across the Gulf, more and more business is impacted each day. This delay is likely to total in the millions of dollars until the site is cleaned.

    And clearly, the impact of sea life in the Gulf is immediate and could be felt for years. Those waters serve as home to numerous fish species and shellfish like shrimp, mussels and oysters we find at markets. Not only is it next to impossible to farm these animals under such conditions, the water quality is sure to be jeopardized by the massive oil spill.

    Please read this site for more information on the environmental and economic damages this explosion, fire and spill have caused: http://www.oil-rig-explosions.com/

  3. I don’t understand why the US Navy cannot use underwater weapon systems to close that well. The flow must be stopped. That is clear. Two months is ridiculous. The cumulative oil will be catastrophic to the Gulf Coast. If traditional weapons systems are inadequate (which I find hard to imagine) the navy could use a small nuclear device to implode the well and shut off that flow.

    • A small nuclear device?
      Seriously, this is not an application for high explosives or nuclear weapons. The shut off valve is stuck. That is where the focus needs to be, in stopping the flow.
      An unmitigated disaster that won’t be helped with off the wall tactics.

      • Actually a small nuclear device would probably work. The Russians have done it five times in the past to stop out of control underwater oil leaks. Russia is the largest oil producer in the world what would they know about this?

      • Lets not go down the list of things the Russians do that I don’t want any part of.
        Unlike the Russians, we also understand that the radiation from any nuclear event is not healthy for living things.

  4. Heh. The “OHMYGAWD, what are we gonna deeeeeew” people amuse me. The GOM has natural seepage about the magnitude of the well.

    • Yep, but of course this doesn’t help.
      Nor does this incompetent administration.

  5. N2L, did you see the article in the DMN this morning by JJT?

    Calling for all sports teams to boycott AZ on account of their new law!

    Ignorant, ignorant, ignorant.

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